JP4690172B2 - Mating structure for writing instruments - Google Patents

Description

The present invention relates to a fitting structure for a writing instrument for mutually connecting a plurality of divided cylindrical parts in a writing instrument such as a mechanical pencil or a ballpoint pen.
Specifically, a slit portion extending in the axial direction is notched in one of the overlapping cylinders, and the other cylinder is press-fitted to widen the gap between the slits, thereby reducing the outer diameter. The present invention relates to a fitting structure for a writing instrument that is attached while the diameters of the cylinders are reduced or expanded and the cylinders are fitted together.

Conventionally, as this type of writing instrument fitting structure, a slit portion (split) communicating with the mouth edge of the tail plug cap (lid) is formed in the tube body of the tail plug cap (lid). By inserting it into the rear end opening and narrowing the gap between the slits of the cylindrical body, the outer diameter of the cylindrical body is reduced and can be easily press-fitted. There is one in which the inner peripheral surface of the rear end is fitted so as to be detachable (see, for example, Patent Document 1).
In addition, the shaft tube is detachably connected by fitting the end portions of the front shaft (front shaft) and the rear shaft, and the two slit portions are arranged at equal intervals in the circumferential direction at the rear end opening of the front shaft. By forming the notch in the front end and inserting the front end portion of the rear shaft into the rear end opening portion of the front shaft and widening the gap of the slit portion of the rear end opening portion, the outer diameter can be easily expanded. Some are press-fitted (see, for example, Patent Document 2).

However, according to such a conventional fitting structure for a writing instrument, since the entire circumferential direction of the cylinder is uniformly reduced or expanded by widening the gap of the slit portion, it is easy to insert the cylinder. In pursuit of this, there was a problem that the cylinder could easily come off and could lead to a loss accident.
On the other hand, when the difficulty in removing the cylinder is pursued, there is a problem that it is difficult to insert the cylinder, the assembling performance is inferior, and the production takes time.
Japanese Utility Model Publication No. 27-5615 (first page, Fig. 2-3) Japanese Utility Model Publication No. 64-48293 (first page, Fig. 1-2)

  This invention is made | formed in view of the said conventional situation, The place made into the subject is providing the fitting structure for writing instruments which can make easy to put in and easy to remove | exclude with a simple structure. .

In order to solve the above-described problem, in the first invention, a slit portion extending in the axial direction is notched in one of the mutually overlapping cylinders, and the slit of the slit section is formed by press-fitting with the other cylinder. In the fitting structure for a writing instrument, in which the gap is widened and the outer diameter is changed, and the two cylinders are fitted together, a plurality of the slit portions are formed in the circumferential direction, and any one of the slit portions is formed. One is characterized by being formed deeper than the axial length of the other slits.
In the second invention, in addition to the configuration of the first invention, the one cylindrical body is detachably disposed in the axial direction with respect to the axial cylinder of the writing instrument, and the other cylinder along the outer surface thereof. The cylindrical body is press-fitted and fitted in the axial direction.
In the third invention, in addition to the configuration of the first or second invention, the other cylindrical body is a decorative ring, and the decorative ring is press-fitted in the axial direction along the outer surface of the one cylindrical body. An anti-slip portion that is fitted and engaged in the axial direction is formed on the outer surface of the decorative ring.

The present invention has the following effects by the above configuration.
According to the first invention, by forming any one of the slits formed in a plurality of notches in the circumferential direction in one cylindrical body deeper than the axial length of the other slits, The diameter change amount is large at the location where the deep slit is formed, and the diameter change amount is small at the location where the shallow slot is formed. If the other cylindrical body is pushed in using this, it smoothly enters and fits, and even if a force in the withdrawal direction acts on the fitted other cylindrical body, the amount of change in diameter in the circumferential direction It is hard to come off because the small part is caught.
Therefore, it is possible to achieve both ease of insertion and difficulty of removal with a simple structure.
Therefore, by making the gap between the slits wider and narrower, it is possible to prevent accidents such as loss of the cylinder due to falling out, as well as superior assembly performance, compared to the prior art in which the entire circumferential direction of the cylinder is uniformly reduced or expanded. Manufacturing costs can be reduced.

According to the second invention, the other cylinder is press-fitted in the axial direction along the outer surface of one cylinder that is detachably disposed in the axial direction with respect to the axial cylinder of the writing instrument. Even if one of the cylinders is removed from the cylinder, even if the other cylinder is pulled in the removal direction, the cylinder does not come out because it is caught by the shallow slit forming portion where the diameter change amount is small in the circumferential direction.
Therefore, it is possible to reliably prevent the other cylinder body from being pulled by the pulling force when it is attached or detached.

According to the third aspect of the present invention, the decorative ring is press-fitted in the axial direction along the outer surface of one of the cylindrical bodies, and the anti-slip portion 2b is engaged with the outer surface 2a of the decorative ring 2 in the axial direction. Forming a shallow slit portion that has a non-slip portion 2b of the decorative ring when moving one of the cylinders in the axial direction and has a small diameter variation in the circumferential direction even when pulled in the pulling direction. It will not get out because it is caught in the place.
Therefore, it is possible to reliably prevent the decorative ring from coming off.

  The fitting structure for a writing instrument according to the present invention includes, as shown in FIGS. 1 to 3, a plurality of cylinders 1 and 2 that are divided to form, for example, a shaft cylinder among the components of the writing instrument A. A slit part 3 extending in the axial direction is cut out in one of the cylinders 1 and 2 that overlap each other, and the other cylinder 2 is press-fitted to form a gap in the slit part 3. By narrowing or widening, the outer diameter is reduced or expanded, and the cylinders 1 and 2 are attached while being fitted together.

  One cylindrical body 1 in which the slit portion 3 is notched is formed of an elastically deformable soft synthetic resin or metal, and the other cylindrical body 2 is elastically deformed harder than the material of the one cylindrical body 1. It is made of hard synthetic resin or metal that is difficult to do.

The slit portion 3 is formed in a plurality of notches in the circumferential direction with respect to one cylindrical body 1, and any one of the slit portions 3 is long in the axial direction (vertical direction in the drawing) of the other slit portions. By forming deeper than that, the portion of the cylindrical body 1 where the deep slit portion is formed has a partly large diameter variation, and the portion of the cylindrical body 1 where the shallow slit portion is formed is partially The cylindrical body 1 is biased (shifted) in the diameter change amount in the circumferential direction so that the diameter change amount becomes small.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  In the first embodiment, as shown in FIGS. 1A and 1B, the one cylinder 1 is a tail plug cap disposed at the rear end of the shaft cylinder A1 of the writing instrument A. One of the plurality of slits 3 formed in the rear end of the cap 1 is made deeper than the axial length of the other slits, and the gaps are narrowed to reduce the rear end of the tail cap cap 1. The case where the decorative ring is press-fitted in the axial direction as the other cylindrical body 2 along the outer side surface 1a by reducing the outer diameter on the side, and the two are fitted and attached so as to be immovable at least in the axial direction. ing.

  As shown in FIG. 3, the writing instrument A is opened and closed with a mechanical pencil (not shown) connected to the rear end side of the barrel A1 as disclosed in, for example, Japanese Patent Laid-Open No. 2005-1111876. A possible clip 4 and a plurality of pushers 5 to which a plurality of ballpoint pens (not shown) are connected, respectively, and one selected clip 4 or pusher 5 is axially moved along each guide hole A2. By sliding to the center, the writing part (not shown) of the mechanical pencil or ballpoint pen is projected and retracted from the front end (not shown) of the front end of the axial tube A1, and the writing part of the mechanical pencil protrudes, A structure in which a lead core (not shown) is fed out from the writing portion by knocking the clip 4 is shown.

At the rear end of the shaft tube A1 of the writing instrument A, a storage tube portion A3 in which a columnar eraser 6 is detachably stored is integrally projected, and the tail portion is protruded from the outer peripheral surface of the storage tube portion A3. The stopper cap 1 is detachably attached.
In the illustrated example, the storage cylinder portion A3 at the rear end of the shaft cylinder A1 and the tail cap cap 1 are respectively formed in a cylindrical shape and fitted.
In addition, it is also possible to form and fit the storage tube portion A3 and the tail cap cap 1 at the rear end of the shaft tube A1 into a rectangular tube shape having a polygonal cross section.

As shown in FIGS. 1A, 1B and 2, the tail plug cap 1 is formed in a cylindrical shape or a rectangular tube shape, and has an outer surface 1a recessed along an outer surface thereof. The rear end is closed in a dome shape, and three slits 3 are radially formed from the center position of the closed surface 1b at regular intervals in the circumferential direction in the illustrated example, and the slits 3a, 3b, Any one of 3c (3a in this embodiment) is extended to the outer surface 1a so as to be deeper than the axial length of the other slit portion 3a.
In addition, it is also possible to form notches in the slit portion 3 in the circumferential direction.

  At the front end of the tail cap cap 1, an opening 1 c having the same diameter as that of the storage cylinder A 3 of the shaft cylinder A 1 is opened. Between the opening 1 c and the storage cylinder A 3 of the shaft cylinder A 1, As shown in FIG. 3, it is preferable to form locking portions 1d for retaining each other that engage with each other.

  Further, it is preferable to form an anti-slip portion 2b that engages in the axial direction on the outer surface 2a of the decorative ring 2, and in the illustrated example, an annular recess is provided in the circumferential direction as the anti-slip portion 2b. There are multiple recesses.

Furthermore, according to a preferred example of this embodiment, the outer surface 1a of the tail cap cap 1 and the inner surface 2c of the decorative ring 2 gradually increase in diameter in the press-fitting direction (vertical direction in the drawing) of both of them. It is preferable to form in a tapered shape.
The outer side surface 1a of the tail cap cap 1 and the inner side surface 2c of the decorative ring 2 can be formed in a cylindrical shape having the same diameter in the press-fitting direction of both.

Next, the effect of such a writing instrument fitting structure will be described.
When a uniform external force acts toward the center of the dome-shaped closing surface 1b of the tail plug cap 1 over its entire circumference, as shown in FIG. 2, a portion where a deep slot 3a is formed in the axial direction. The diameter reduction amount becomes large, and the portion where the shallow slit portion 3b is formed has a small diameter reduction amount, and the diameter reduction amount is biased in the circumferential direction.

  Therefore, when the decorative ring 2 is pushed in along the dome-shaped closing surface 1b of the cap plug 1 as shown in FIGS. 1 (a) and 1 (b) and FIG. The inner side surface 2c of the decorative ring 2 is fitted to the outer side surface 1a of the tail cap cap 1 without starting to enter smoothly from the deep slit portion 3a having a large amount and being pushed in with a strong force.

In this fitted state, even if a force acts from the tail cap cap 1 in the direction in which the decorative ring 2 is pulled out, there is a shallow slit portion 3b where the amount of diameter reduction is small in the circumferential direction. hard.
Therefore, it is possible to achieve both ease of insertion of the decorative ring 2 with respect to the tail cap cap 1 and difficulty of removal while having a simple structure.

  Further, in order to remove the tail plug cap 1 with the tail cap cap 1 into which the decorative ring 2 is press-fitted fitted into the storage cylinder portion A3 at the rear end of the shaft cylinder A1, the decoration ring must be removed each time. Pull 2 while picking it with your finger.

In other words, when the tail cap cap 1 is removed, the decoration ring 2 is pulled in a direction opposite to the press-fitting direction, and therefore, it is particularly easy to be removed. However, as described above, the decoration ring 2 is pulled in the direction of removal. However, it does not come out because it is caught by the formation portion of the shallow slit portion 3b having a small diameter reduction in the circumferential direction.
As a result, it is possible to reliably prevent the decorative ring 2 from being pulled, which is subjected to a pulling force when being attached or detached.

  In the above-described embodiment, one cylinder 1 is a tail plug cap disposed at the rear end of the shaft cylinder A1 of the writing instrument A, and a decorative ring is press-fitted and fitted as the other cylinder 2 along the outer peripheral surface 1a. However, the present invention is not limited to this. Although not shown, the decorative ring is press-fitted into the knock cap disposed at the rear end of the mechanical pencil in place of the tail cap cap 1 or the outer periphery of the shaft tube. You may utilize when a decorative ring, a grip, and a front-end metal fitting are press-fitted and fitted as the other cylindrical body 2 along the surface.

  Further, as disclosed in, for example, Japanese Utility Model Laid-Open No. 64-48293, when the ends of the front shaft and the rear shaft constituting the shaft cylinder are connected to each other, the fitting structure for a writing instrument of the present invention is used. It is also possible to do.

  In addition, according to the writing instrument A, the structure in which the writing part of the mechanical pencil or the ballpoint pen is projected and retracted from the front end of the front end of the shaft cylinder A1 by the sliding operation of the clip 4 or the pusher 5 is shown. It is not limited, The ball-point pen of another structure, a mechanical pencil, a felt pen, etc. may be sufficient.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows one Example of the fitting structure for writing instruments of this invention, (a) shows the state before fitting, (b) has shown the state after fitting. It is a vertical side view along the (2)-(2) line of Fig.1 (a), the middle of fitting is shown as the continuous line, and the state after fitting is shown with the dashed-two dotted line. It is a reduced perspective view which shows the installation state of the tail cap cap with respect to a writing instrument.

Explanation of symbols

A writing instrument A1 shaft cylinder 1 cylinder 1a outer side 2 cylinder 2a outer side 2b non-slip part 3 slot part

Claims (3)

A slit (3) extending in the axial direction is formed in one of the cylinders (1, 2) overlapping each other, and the slit (3) of the slit (3) is formed by press-fitting with the other cylinder (2). In the fitting structure for a writing instrument, the gap is widened and the outer diameter thereof is changed, and both cylinders (1, 2) are attached while being fitted to each other.
A plurality of slits (3) are formed in the circumferential direction, and any one of the slits (3) is formed deeper than the axial length of the other slits. Mating structure. The one cylindrical body (1) is detachably disposed in the axial direction with respect to the axial cylinder (A1) of the writing instrument (A), and the other cylindrical body (2) is pivoted along the outer surface (1a). The fitting structure for a writing instrument according to claim 1, wherein the fitting structure is press-fitted in a direction. The other cylindrical body (2) is a decorative ring. The decorative ring (2) is press-fitted in the axial direction along the outer surface (1a) of the one cylindrical body (1). The fitting structure for a writing instrument according to claim 1, wherein a non-slip portion (2 b) that engages in the axial direction is formed on the outer surface (2 a).

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